I just found this forum and have done several searches but I still have some questions. I am a metal working hobbiest and have taken an interest in building an EDM suitable for hobby work. In some articles I'v read a source of high frequency voltage is required, but at what voltage? In other articles there is no mention of an HF voltage. I have a tig welder and was wondering if it could be adapted to make a simple EDM . In other words I don't know enough about the subject to ask an intelligent question. Perhaps someone could direct me to more basic info so I don't bore you with dumb questions !!!!